The billionaire investor owns 12.9 percent of the video game company.

Carl Icahn, who made waves a few weeks ago by disclosing he had taken nearly a 10 percent stake in Netflix, has upped his position in Take-Two Interactive Software, the video game company behind the Grand Theft Auto franchise.

Icahn, a billionaire investor regarded in some circles as a corporate raider and others as an activist shareholder, upped his stake in Take-Two to 12.9 percent, according to a regulatory filing Tuesday. He previously held an 11.7 percent stake, and a week ago he had less than 10 percent.

Icahn purchased 767,300 shares of Take-Two on Monday and 330,900 on Tuesday, paying $11.44 per share and taking his overall position to more than 11.7 million shares, according to the filing.